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Slides and Opaques for Television Film Chains, PH22.94
A PROPOSED STANDARD on slides and opaques for television use is published on the following pages for three months of trial and criticism. All comments should be sent to Henry Kogel, SMPTE Staff Engineer, prior to July 1, 1953. If no adverse comments are received, the proposal will then be submitted to ASA Sectional Committee PH22 for further processing as an American Standard. The proposal was prepared by the Joint RTMA/SMPTE Television Film Equipment Committee.
Work on the proposal was started in 1950. At that time there existed an American Standard on Lantern Slides (Z38.7. 149-1 950) but it was concerned only with slides intended for direct viewing on a projection screen. The inflexible demand of the television system for a 3 by 4 aspect ratio forced all users to depart from some of the provisions of Z38.7.149. As a result, numerous local standards came into use but there was little agreement among the standards of different organizations or different areas.
When the Committee first explored this subject, it was realized that a major service could be performed simply by
securing widespread agreement on the exact dimensions of each of the slide sizes in common use. It also seemed that an additional service might be rendered if agreement could be secured on the use of fewer sizes.
In an initial burst of optimism, the Committee prepared a proposal based on the use of just two sizes. This proposal was widely circulated in 1951 among the membership of the SMPTE, the RTMA, and the National Association of Radio and Television Broadcasters. Responses to this first effort indicated that everyone felt it advisable to accept as standard no more than two sizes. However, there was little or no agreement on the two sizes that should be selected for standardization. Altogether nine sizes were suggested for standardization. The Committee was able to cut this number back to four by insisting that widespread usage at this time was a necessary condition for adoption of any size.
At no time has there been any serious objection to the exact dimensions included in the Proposed Standard. Users seem to be content with any number so long as everyone accepts it. — F. N. Gillette.
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April 1953 Journal of the SMPTE Vol. 60